Iver Johnson Murder gun

Well I was put in contact with a guy that researched Joseph Zullo and it turns out no Zullo was ever executed by the state of New York or by the Federal prison system. Looks like the story is a hoax after all.
I think the Wanted flyer is probably real. I would love to just find out
who Jospeh Zullo was and If they ever did get him put behind bars.
If anyone else out there has any suggestions please let me know.
Thanks a lot!

in the 1920 census there was one joseph zullo (age does not match up) living in essex new jersey with several more zullo's in other cities. the census listing stated that the name was sometime spelled zulla.
bill